CHANGELOG.md

Changelog

Unreleased

Compiler

• Optimised code generated for record updates. (yoshi)

• The compiler now allows for record updates to change the generic type parameters of the record:

  type Box(value) {
    Box(password: String, value: value)
  }
  
  fn insert(box: Box(a), value: b) -> Box(b) {
    Box(..box, value:)
  }

  (yoshi)

• It is now allowed to write a block with no expressions. Like an empty function body, an empty block is considered incomplete as if it contained a todo expression. (Giacomo Cavalieri)

• The shorthand names for the two targets, erl and js are now deprecated in code such as @target. (Surya Rose)

Build tool

• Improved the error message you get when trying to add a package that doesn't exist with gleam add. (Giacomo Cavalieri)

Language Server

• The language server now provides type information when hovering over argument labels. (Surya Rose)

• The Language Server now suggests a code action to desugar a use expression into the equivalent function call. For example, this snippet of code:

  pub fn main() {
    use profile <- result.try(fetch_profile(user))
    render_welcome(user, profile)
  }

  Will be turned into:

  pub fn main() {
    result.try(fetch_profile(user), fn(profile) {
      render_welcome(user, profile)
    })
  }

  (Giacomo Cavalieri)

Formatter

• The formatter now adds a todo inside empty blocks. (Giacomo Cavalieri)

Bug fixed

• The compiler now throws an error when a float literal ends with an e and is missing an exponent. (Surya Rose)

• Fixed a bug where the compiler would crash when pattern matching on multiple subjects and one of them being a constant record. (Surya Rose)

v1.6.1 - 2024-11-19

Bug fixed

• Fixed a bug where gleam update would fail to update versions.